Damper



W. A. HANCE.

DAMPER.

No. 408,467. Patented May 14, 1889..

j M i UNITE STATES PATENT OFFICE.

VILLIAM A. IIANCE, OF FREEPORT, ILLINOIS, ASSIGNOR TO THE \VARNER MANUFACTURING COMPANY, OF ILLINOIS.

DAMPER.

SPECIFICATION forming part of Letters Patent No. 403,467, dated May 14, 1889. Application filed February 19, 1889. Serial No. 300,419. (No model.)

T0 whom it may concern.-

Be it known that 1, WILLIAM A. HANCE, a resident of Freeport, in the county of Ste phenson and State of Illinois, have invented certain new and useful Improvements in Dampers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to stove-pipe dampers, and particularly to combining with the damper-blade a handle that may be detachably secured to the blade after the latter has been inserted in the pipe.

The invention is fully set forth in this specification and the accompanying drawings, wherein- Figure 1 shows the damper seen from above when in position to cut off the draft in a vertical pipe. Fig. 2 is a section on the line x :r, Fig. 1. Fig. 3 is an enlarged detail View of a part of the apparatus shown in Fig. 1. Figs. 4, 5, 6, and 7 show modified forms of the external portion of the handle. Figs. 8 and 9 show the blade with handles modified both as to external and internal construction. Fig. 10 is a section on the line y y, Fig. 8.

In the drawings, A is a damper-blade provided with a radial groove spanned by bridges O O O and terminating in an opening, 'D. In line with this groove, upon the opposite side of the blade, is a short gudgeon, E, to enter a suitable aperture in the pipe. A handle-shaft, G, enters through an opening in the pipe diametrically opposite to the aperture for the gudgeon E, and with the latter serves as an axis upon which the damper may rotate. The shaft is carried to a suitable distance without the pipe, coiled at H and H, and then carried back nearly to the pipe, where it is coiled about its own main portion to form a yielding shoulder, K, resting against the exterior of the pipe. The inner end of the shaft is bent at right angles to form a short hook, I, for engaging the blade.

To secure the damper in position, the gudgeon E is inserted in its aperture, and the groove is brought into diametrical line with it, the shaft with its hook upward is passed through the pipe into the groove and advanced to the bridge 0, then rotated, turning the hook downward through the opening J, advanced to the bridge 0, and rotated to bring the hook again upward through an ap- 55 erture, J, when it is again advanced till the shoulder K meets the pipe. The hook will now be at the beginning of the inclined wall of the openingD, as indicated in dotted lines in Fig. 3. If the shaft be now forcibly ro- 6o tated while the damper is held fast, the hook passes along the incline and draws the shaft inward, the coils at K H H yielding until it leaves the incline and passes into the space inclosed by the inner edge of the Wall of the opening D. Then in its continued rotation the hook becomes perpendicular to the blade,

it is drawn back into a notch, M, by the elastic force of the coils, and the damper is ready foruse. Thedamper maybe disengaged either by great torsional force applied While the blade is held fast or by pressing the shaft inward and then reversing the motions of insertion.

The form of the external springs may be varied, as indicated in Figs. 4, 5, 6, and 7. As shown in Figs. at and 5, the coils H H are omitted, and a single coil of helical form is used next the pipe. As shown in Fig. 5, the coil is replaced by a spring formed by carrying the wire back and forth in its own plane, and in Fig. 6 both forms are employed.

The remaining figures illustrate single-wire constructions, where the shaft is double and forms at its inner end a loop, 0, that passes over a hook, P, upon the plate or blade. In these cases the loop is passed over the hook by pressing inward upon the handle, and is drawn back beneath it by the recoil of the springs outside the pipe, which act in the same manner as in the other cases. It is evident that when the loop is employed no rotation is required to engage or disengage the loop and hook.

Vhat I claim is- 1. In a damper, the combination, with a blade having a recess for the bent end of a handle-shaft or spindle, of a handle-shaft having at its inner end a lateral bend lying in said recess and having its outer end bent upon it- 100 self, forming a spring pressing the edge of the blade, whereby the force of the spring tending to withdraw the shaft longitudinally,

presses the bent end intothe recess and maintains the engagement of the handle with the blade. r 2. The combination, with a blade having a radial passage into which a handle-shaft may be thrust and at the inner end of the passage a recess adapted to receive the laterally-bent end of such shaft, of a handle-shaft provided at its inner end with a bend or hook and hav-' ing its outer end returned upon itself in the form of a spring pressing the edge of the blade, substantially as set forth.

3. The combination, with the blade having the groove, the bridges spanning the same, the. openings, and the recess for the hooked end of the handle-shaft, of the liandle shaft having the hooked inset end lying in said recess and the integrally-formed spring pressing the edge of the blade, substantially as set forth.

4. The combination, with the blade A, hav-.

ing witnesses. WILLIAM A. HANCE.

vvitiiessesi v I W- HANC JAoo'is' BURKHART. 

